WO2017141600A1 - Antenna device and electronic apparatus - Google Patents

Abstract

An antenna device (100) is equipped with a plate-like dielectric substrate (1), an antenna element (2) provided on the dielectric substrate (1), and a stub element (3) provided on the dielectric substrate (1). The dielectric substrate (1) has a first edge extending along the lengthwise direction of the dielectric substrate (1), and a second edge extending along the lengthwise direction of the dielectric substrate (1) and facing the first edge. The antenna element (2) is provided along the lengthwise direction of the dielectric substrate (1). The antenna element (2) has a first end part having a power supply point (P1), and a second end part having an open end. The stub element (3) is provided along the lengthwise direction of the dielectric substrate (1) between the first edge of the dielectric substrate (1) and a section of the antenna element (2) that has a predetermined length and includes the first end part of the antenna element (2). The stub element (3) has a first end part connected to a reference potential, and a second end part having an open end.

Description

ANTENNA DEVICE AND ELECTRONIC DEVICE

The present disclosure relates to an antenna device for an electronic device that operates as a portable wireless communication device. The present disclosure relates to an electronic apparatus including such an antenna device.

As an antenna device for an electronic device that operates as a portable wireless communication device, for example, there are antenna devices described in Patent Documents 1 to 3.

Japanese Patent No. 4792173 Japanese Patent No. 5301608 JP 2014-116883 A

The antenna device according to one embodiment of the present disclosure includes a plate-like dielectric substrate, an antenna element provided on the dielectric substrate, and a stub element provided on the dielectric substrate. The dielectric substrate has a first edge extending along the longitudinal direction of the dielectric substrate, and a second edge extending along the longitudinal direction of the dielectric substrate and facing the first edge. The antenna element is provided along the longitudinal direction of the dielectric substrate, and the antenna element has a first end portion having a feeding point and a second end portion having an open end. The stub element is provided along the longitudinal direction of the dielectric substrate between a predetermined length of the antenna element including the first end of the antenna element and the first edge of the dielectric substrate. , Having a first end connected to the reference potential and a second end having an open end.

FIG. 1 is a perspective view illustrating a configuration of an electronic apparatus according to the first embodiment. FIG. 2 is a side view of the electronic device of FIG. FIG. 3 is a plan view showing the configuration of the antenna device 100 of FIG. FIG. 4 is a graph showing the magnetic field strength in the vicinity of the antenna device 100 of FIG. FIG. 5 is a graph showing the magnetic field strength in the vicinity of the antenna device 200 according to the first comparative example. FIG. 6 is a plan view showing the configuration of the antenna device 100A according to the second embodiment. FIG. 7 is a graph schematically showing the frequency characteristics of VSWR of the antenna apparatus of FIG. FIG. 8 is a graph showing the magnetic field strength in the vicinity of the antenna device 100A of FIG. FIG. 9 is a graph showing the magnetic field strength in the vicinity of the antenna device 200A according to the second comparative example. FIG. 10 is a plan view showing a configuration of an antenna device 100B according to the third embodiment. FIG. 11 is a graph schematically showing the frequency characteristics of the VSWR of the antenna device of FIG. FIG. 12 is a plan view showing a configuration of an antenna device 100C according to the fourth embodiment. FIG. 13 is a plan view showing the configuration of the surface of the antenna device 100D according to the fifth embodiment. FIG. 14 is a plan view showing the configuration of the back surface of the antenna device 100D of FIG. FIG. 15 is a plan view showing a configuration of an antenna device 100E according to the sixth embodiment. FIG. 16 is a plan view showing the configuration of the back surface of the antenna device 100E of FIG.

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

In addition, the inventor (s) provides the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, and these are intended to limit the claimed subject matter. It is not a thing.

In the description of each embodiment, reference is made to XYZ coordinates shown in the drawings.

In each drawing, components having the same reference numerals have substantially the same function even if details such as shape or size are different.

[1. Embodiment 1]
Hereinafter, the antenna device and the electronic apparatus according to the first embodiment will be described with reference to FIGS.

[1-1. Constitution]
FIG. 1 is a perspective view illustrating a configuration of an electronic apparatus according to the first embodiment. FIG. 2 is a side view of the electronic device of FIG. The electronic apparatus of FIG. 1 includes a housing including an outer housing 21 and a metal chassis 22 and at least one (two in the example of FIG. 1) antenna devices 100-1 and 100-2. The electronic device in FIG. 1 is a tablet-type electronic device including a touch panel display device 23.

The outer casing 21 is made of a dielectric and accommodates each component of the electronic device. The metal chassis 22 is made of a conductor and is provided inside the outer casing 21. In the present specification, the outer casing 21 is also referred to as an “outer casing portion”, and the metal chassis 22 is also referred to as an “inner casing portion”. The outer casing 21 of the electronic device has a first surface and a second surface that face each other. The electronic device includes a display device 23 provided on the first surface of the outer casing 21. Hereinafter, the first surface (the surface on the + Z side in FIG. 1) of the outer housing 21 is referred to as “front surface”, and the second surface (the surface on the −Z side in FIG. 1) of the outer housing 21 is referred to as “rear surface”.

The antenna devices 100-1 and 100-2 are connected to the high-frequency signal sources 11-1 and 11-2, respectively.

Hereinafter, the antenna devices 100-1 and 100-2 in FIG. 1 are collectively referred to as “antenna device 100”. Further, the high-frequency signal sources 11-1 and 11-2 in FIG. 1 are collectively referred to as “high-frequency signal source 11”.

FIG. 3 is a plan view showing the configuration of the antenna device 100 of FIG. The antenna device 100 includes a plate-shaped dielectric substrate 1, an antenna element 2, a stub element 3, and a ground conductor G1 provided on the dielectric substrate 1. Dielectric substrate 1 has a longitudinal direction in the direction along the Y-axis in FIG. The dielectric substrate 1 has a first edge (edge on the + X side in FIG. 3) extending along the longitudinal direction of the dielectric substrate 1 and a first edge extending along the longitudinal direction of the dielectric substrate 1. And a second edge (an edge on the −X side in FIG. 3). The antenna element 2 is provided along the longitudinal direction of the dielectric substrate 1. The antenna element 2 has a first end having a feeding point P1 (end on the −Y side in FIG. 3) and a second end having an open end (end on the + Y side in FIG. 3). A ground conductor G1 is provided to face the first end of the antenna element 2. The ground conductor G <b> 1 is electrically connected to the metal chassis 22. The feed point P1 and the connection point P2 on the ground conductor G1 are connected to the high-frequency signal source 11 via a feed line that is a coaxial cable, for example. At this time, the inner conductor of the feeder line is connected to the feeding point P1 of the antenna element 2, the outer conductor of the feeder line is connected to the connection point P2, and the antenna device 100 is unbalancedly fed via the feeder line. The stub element 3 has a predetermined length of the antenna element 2 including the first end of the antenna element 2 (that is, a section in the vicinity of the feeding point P1) and the first edge of the dielectric substrate 1. It is provided along the longitudinal direction of the dielectric substrate 1. The stub element 3 has a first end connected to the ground conductor G1 (that is, connected to the reference potential) and a second end having an open end.

The stub element 3 is configured such that its electrical length is less than ¼ of the operating wavelength of the antenna device and is shorter than the electrical length of the antenna element 2. When the antenna device 100 operates at the resonance frequency of the antenna element 2, the antenna element 2 and the stub element 3 have a high-frequency current (a dotted line in FIG. Current) flows.

The antenna device 100 is arranged such that the first edge of the dielectric substrate 1 faces the outer casing 21 and the second edge of the dielectric substrate 1 faces the metal chassis 22.

Further, as shown in FIG. 2, the dielectric substrate 1 may be disposed closer to the front surface than the rear surface of the housing. Further, the dielectric substrate 1 may be disposed on substantially the same plane as the display surface of the display device 23.

[1-2. Operation]
Next, the reduction of the specific absorption rate (SAR) in the antenna device 100 of FIG. 3 will be described.

Since an electronic device that operates as a portable wireless communication device is used in the vicinity of the human body, part of the radiated power from the antenna is absorbed by the human body. The SAR is one of the indexes of the absorption amount, and is expressed by the following equation (1) using the conductivity σ, the specific gravity ρ, and the magnetic field strength E.

SAR = σ / (2ρ) × | E | ² (1)
FIG. 4 is a graph showing the magnetic field strength in the vicinity of the antenna device 100 of FIG. FIG. 5 is a graph showing the magnetic field strength in the vicinity of the antenna device 200 according to the first comparative example. The antenna device 200 of FIG. 5 has a configuration in which the stub element 3 is removed from the antenna device 100 of FIG. Similar to the antenna device 100 of FIG. 3, the antenna device 200 of FIG. 5 includes a plate-shaped dielectric substrate 1, an antenna element 2 provided on the dielectric substrate 1, and a ground conductor G1. The antenna device 200 of FIG. 5 is provided in a housing including the outer housing 21 and the metal chassis 22, similarly to the antenna device 100 of FIG. 3. In the graphs of FIGS. 4 and 5, the color shading represents the strength of the magnetic field strength. According to equation (1), the strength of the magnetic field strength corresponds to the magnitude of the SAR value.

According to FIGS. 4 and 5, the antenna device 100 of FIG. 3 includes the stub element 3, so that a high frequency current flows in a loop around the area sandwiched between the antenna element 2 and the stub element 3. The magnetic field strength of the region is increased. However, as a result, the magnetic field strength (that is, radiated power) on the + X side of the antenna device 100 can be drastically reduced according to the distance. By reducing the magnetic field strength, it is possible to make it difficult for the SAR to increase on the + X side of the antenna device 100, particularly on the outer side of the outer casing 21.

It is also possible to make SAR less likely to increase by disposing the dielectric substrate 1 closer to the front surface than the rear surface of the housing. When the electronic device is provided with the display device 23, it is considered that the electronic device is held by the user's hand or the like from the rear surface during use. Therefore, it is highly necessary to make SAR less likely to increase on the rear surface than on the front surface of the electronic device. However, since the magnetic field intensity E is inversely proportional to the distance, according to the equation (1), the SAR can be reduced by moving the antenna away from the human body. In the electronic device of FIG. 1, by disposing the dielectric substrate 1 closer to the front surface than the rear surface of the housing, it is possible to make it difficult for SAR to increase on the rear surface of the electronic device. In particular, by disposing the dielectric substrate 1 on substantially the same plane as the display surface of the display device 23, the effect of preventing the increase in SAR on the rear surface of the electronic device is maximized.

[1-3. Effect]
The antenna device 100 according to the first embodiment includes a plate-shaped dielectric substrate 1, an antenna element 2 provided on the dielectric substrate 1, and a stub element 3 provided on the dielectric substrate 1. Dielectric substrate 1 has a first edge extending along the longitudinal direction of dielectric substrate 1 and a second edge extending along the longitudinal direction of dielectric substrate 1 and facing the first edge. . The antenna element 2 is provided along the longitudinal direction of the dielectric substrate 1, and the antenna element 2 has a first end portion having a feeding point P1 and a second end portion having an open end. The stub element 3 is provided along the longitudinal direction of the dielectric substrate 1 between a predetermined length of the antenna element 2 including the first end of the antenna element 2 and the first edge of the dielectric substrate 1. The stub element 3 has a first end connected to the reference potential and a second end having an open end.

In the antenna device 100 of the first embodiment, the stub element 3 is configured such that its electrical length is less than ¼ of the operating wavelength of the antenna device and shorter than the electrical length of the antenna element 2. Also good. The antenna element 2 and the stub element 3 are arranged so that a high-frequency current flows in a loop around the area sandwiched between the antenna element 2 and the stub element 3 when the antenna device 100 operates at the resonance frequency of the antenna element 2. It may be.

According to the antenna device of the first embodiment, when an antenna device is mounted around a display device in a tablet-type electronic device, it is possible to make it difficult for SAR to increase on the side of the electronic device.

The electronic apparatus of Embodiment 1 includes a housing and at least one antenna device 100. The casing includes an outer casing portion made of a dielectric and an inner casing portion provided inside the outer casing portion and made of a conductor. Each of the at least one antenna device 100 is arranged such that the first edge of the dielectric substrate 1 faces the outer casing portion and the second edge of the dielectric substrate 1 faces the inner casing portion.

In the electronic device according to the first embodiment, the housing may have a first surface and a second surface facing each other, and the electronic device may further include a display device 23 provided on the first surface of the housing. . The dielectric substrate 1 may be disposed closer to the first surface than the second surface of the housing.

In the electronic apparatus of Embodiment 1, the dielectric substrate 1 may be disposed on substantially the same plane as the display surface of the display device 23.

According to the electronic device of Embodiment 1, it is possible to make it difficult for SAR to increase on the side of the electronic device. According to the electronic device of the first embodiment, the dielectric substrate 1 is arranged closer to the first surface than the second surface of the housing, thereby making it difficult to increase the SAR on the rear surface of the electronic device. .

[2. Second Embodiment]
The electronic apparatus according to the second embodiment will be described below with reference to FIGS.

[2-1. Constitution]
FIG. 6 is a plan view showing the configuration of the antenna device 100A according to the second embodiment. The antenna device 100A includes a plate-shaped dielectric substrate 1, an antenna element 2, a stub element 3, a ground element 4, and ground conductors G1 and G2 provided on the dielectric substrate 1. The antenna device 100A substantially further includes a ground element 4 and a ground conductor G2 in addition to the components of the antenna device 100 of FIG.

The ground conductor G2 is provided so as to face the second end (open end) of the antenna element 2. The ground conductor G <b> 2 is electrically connected to the metal chassis 22.

The ground element 4 is a “parasitic element” that is grounded. The ground element 4 has a first end connected to the ground conductor G1 (that is, connected to the reference potential) and a second end having an open end. A section of the predetermined length of the ground element 4 including the second end of the ground element 4 faces the second end (open end) of the antenna element 2 and is electromagnetically coupled to the second end of the antenna element 2. It is provided to do. The ground element 4 is disposed with respect to the antenna element 2 such that the first end of the ground element 4 is farther from the feed point P1 than the second end of the ground element 4.

The ground element 4 is configured to resonate at a frequency within the operating frequency band of the antenna element 2 or at a frequency within a frequency band adjacent to the operating frequency band of the antenna element 2.

[2-2. Operation]
FIG. 7 is a graph schematically showing the frequency characteristics of VSWR of the antenna apparatus of FIG. The SAR increases in the vicinity of the portion where the high-frequency current is concentrated on the conductor. In particular, the higher the frequency, the shorter the wavelength, so that the current is concentrated on a narrow area on the conductor, and the SAR in the vicinity thereof also increases. Generally, in a high frequency band (for example, 5 GHz band) used in a wireless LAN, local power concentration is likely to occur, and it is difficult to reduce SAR. For this reason, in the antenna device 100A, the ground element 4 resonates at a high frequency within the operating frequency band of the antenna element 2 or resonates at a frequency in a high frequency band adjacent to the operating frequency band of the antenna element 2. Configured as follows.

When the antenna element 2 is excited at the resonance frequency of the ground element 4, a high-frequency current flows from the feeding point P 1 to the antenna element 2, and then due to electromagnetic coupling between the antenna element 2 and the ground element 4, the ground element 4. Flows up. The high-frequency current that has flowed to the ground element 4 flows to the ground conductor G <b> 2 and the metal chassis 22. As described above, the ground element 4 is disposed with respect to the antenna element 2 so that one end thereof is remote from the feeding point P1. Therefore, when the high frequency current flows from the feeding point P1 to the end of the grounding element 4 that is remote, the range in which the high frequency current is distributed becomes wider than when the grounding element 4 does not exist. Since the high-frequency current flows to the ground element 4, the ground conductor G 2, and the metal chassis 22, current concentration on the antenna element 2 is alleviated, and an increase in SAR is suppressed as compared with the antenna device 100 of the first embodiment.

FIG. 8 is a graph showing the magnetic field strength in the vicinity of the antenna device 100A of FIG. FIG. 9 is a graph showing the magnetic field strength in the vicinity of the antenna device 200A according to the second comparative example. The antenna device 200A of FIG. 9 has a configuration in which the ground element 4 is removed from the antenna device 100A of FIG. The antenna device 200A in FIG. 8 is similar to the antenna device 100A in FIG. 6 in that the plate-shaped dielectric substrate 1, the antenna element 2, the stub element 3, and the ground conductors G1, G2 provided on the dielectric substrate 1 are used. And. The antenna device 200A in FIG. 8 is provided in a housing including the outer housing 21 and the metal chassis 22 in the same manner as the antenna device 100A in FIG.

8 and 9, the antenna device 100A shown in FIG. 6 includes the grounding element 4, thereby relaxing the current concentration on the antenna element 2 and suppressing the increase in SAR. The antenna device 100A can suppress an increase in SAR while maintaining the overall radiated power of the antenna device 100A.

[2-3. Effect]
The antenna device 100 </ b> A according to the second embodiment further includes a ground element 4 provided on the dielectric substrate 1. The ground element 4 has a first end connected to the reference potential and a second end having an open end, and a section of the predetermined length of the ground element 4 including the second end of the ground element 4 is The antenna element 2 is provided so as to face the second end. The ground element 4 is configured to resonate at a frequency within the operating frequency band of the antenna element 2 or at a frequency within a frequency band adjacent to the operating frequency band of the antenna element 2.

According to the antenna device 100A of the second embodiment, an increase in SAR can be suppressed even when operating at a high frequency. In particular, when an antenna device is mounted around a display device in a tablet-type electronic device, it is possible to make it difficult for SAR to increase on the side of the electronic device.

According to the antenna device 100A of the second embodiment, the antenna device 100A can be broadened by causing the ground element 4 itself to resonate and contribute to radiation.

[3. Embodiment 3]
Hereinafter, an electronic apparatus according to the third embodiment will be described with reference to FIGS.

[3-1. Constitution]
FIG. 10 is a plan view showing a configuration of an antenna device 100B according to the third embodiment. The antenna device 100B includes a plate-like dielectric substrate 1, and an antenna element 2, a stub element 3, a parasitic element 5, and a ground conductor G1 provided on the dielectric substrate 1. The antenna device 100B substantially further includes a parasitic element 5 in addition to the components of the antenna device 100 of FIG.

Parasitic element 5 is a “parasitic element” that is not grounded. At least a part of the parasitic element 5 is provided so as to face the second end (open end) of the antenna element 2 and to be electromagnetically coupled to the second end of the antenna element 2. The parasitic element 5 is formed in a U-shaped pattern shape on the dielectric substrate 1, and both end portions of the parasitic element 5 are closer to the second end portion of the antenna element 2 than the central portion of the parasitic element 5. It may be provided as follows. The parasitic element 5 is not electrically connected to other conductors (such as the ground conductor G1 and the metal chassis 22).

The parasitic element 5 is configured to resonate at a frequency within the operating frequency band of the antenna element 2 or at a frequency within a frequency band adjacent to the operating frequency band of the antenna element 2.

[3-2. Operation]
FIG. 11 is a graph schematically showing the frequency characteristics of the VSWR of the antenna device of FIG. In the antenna device 100B, the parasitic element 5 is configured to resonate at a high frequency within the operating frequency band of the antenna element 2 or to resonate at a frequency in a high frequency band adjacent to the operating frequency band of the antenna element 2. Is done.

When the antenna element 2 is excited at the resonance frequency of the parasitic element 5, a high-frequency current flows from the feeding point P 1 to the antenna element 2, and then, due to electromagnetic coupling between the antenna element 2 and the parasitic element 5, the parasitic element 5 Flows up. Since the high-frequency current flows from the feeding point P1 to the end of the parasitic element 5 that is remote from the feeding point P1, the range in which the high-frequency current is distributed becomes wider than when the parasitic element 5 does not exist. Since the high-frequency current flows to the parasitic element 5, the concentration of the current on the antenna element 2 is alleviated, and the increase in SAR is suppressed as compared with the case of the antenna device 100 of the first embodiment. The antenna device 100B can suppress an increase in SAR while maintaining the overall radiated power of the antenna device 100B.

[3-3. Effect]
The antenna device 100B of the third embodiment further includes a parasitic element 5 provided on the dielectric substrate 1. At least a part of the parasitic element 5 is provided to face the second end of the antenna element 2. The parasitic element 5 is not electrically connected to other conductors. The parasitic element 5 is configured to resonate at a frequency within the operating frequency band of the antenna element 2 or at a frequency within a frequency band adjacent to the operating frequency band of the antenna element 2.

In the antenna device 100B of the third embodiment, the parasitic element 5 may be formed on the dielectric substrate 1 in a strip shape bent in a U shape. At this time, both end portions of the parasitic element 5 are provided closer to the second end portion of the antenna element 2 than the central portion of the parasitic element 5.

According to the antenna device 100B of the third embodiment, it is possible to make it difficult for SAR to increase even when operating at a high frequency. In particular, when an antenna device is mounted around a display device in a tablet-type electronic device, an increase in SAR can be suppressed on the side of the electronic device.

According to the antenna device 100B of the third embodiment, the electromagnetic coupling with the antenna element 2 can be strengthened by bending the parasitic element 5 into a U shape. As a result, a high-frequency current easily flows between the antenna element 2 and the parasitic element 5, and the current is dispersed.

According to the antenna device 100B of the third embodiment, the antenna device 100B can be widened by resonating the parasitic element 5 itself and contributing to radiation.

[4. Embodiment 4]
Hereinafter, the electronic apparatus according to the fourth embodiment will be described with reference to FIG.

[4-1. Constitution]
FIG. 12 is a plan view showing a configuration of an antenna device 100C according to the fourth embodiment. The antenna device 100C includes a plate-like dielectric substrate 1, and an antenna element 2, a stub element 3, a short-circuit conductor 6, and a ground conductor G1 provided on the dielectric substrate 1. The antenna device 100 </ b> C substantially further includes a short-circuit conductor 6 in addition to the components of the antenna device 100 of FIG. 3.

The antenna element 2 is connected to the ground conductor G1 via the short-circuit conductor 6 on the second edge (−X side edge in FIG. 12) side of the dielectric substrate 1 (that is, connected to the reference potential). . Thereby, the antenna device 100C is configured to operate as an inverted F-type antenna. In general, in an inverted-F antenna, current tends to concentrate on the short-circuit conductor, which may increase SAR. However, in the antenna device 100 </ b> C, by providing the short-circuit conductor 6 between the antenna element 2 and the metal chassis 22, SAR can be reduced on the + X side of the antenna device 100, particularly on the outside of the outer casing 21.

[4-2. Effect]
In the antenna device 100C according to the fourth embodiment, the antenna element 2 is connected to the reference potential via the short-circuit conductor 6 on the second edge side of the dielectric substrate 1, whereby the antenna device 100 operates as an inverted F-type antenna. Is configured to do.

According to the antenna device 100C of the fourth embodiment, an increase in SAR can be made difficult to occur even when configured to operate as an inverted F-type antenna. In particular, when an antenna device is mounted around a display device in a tablet-type electronic device, SAR can be reduced on the side of the electronic device.

[5. Embodiment 5]
Hereinafter, an electronic apparatus according to the fifth embodiment will be described with reference to FIGS.

[5-1. Constitution]
FIG. 13 is a plan view showing the configuration of the surface of the antenna device 100D according to the fifth embodiment. FIG. 14 is a plan view showing the configuration of the back surface of the antenna device 100D of FIG. The antenna device 100D includes a plate-shaped dielectric substrate 1, a stub element 3, a ground element 4, antenna element portions 7 and 8, a via conductor 9, and ground conductors G1 to G4 provided on the dielectric substrate 1. I have. The antenna device 100D substantially includes antenna element portions 7 and 8 and a via conductor 9 instead of the antenna element 2 of the antenna device 100A of FIG. 6, and further includes ground conductors G3 and G4. In FIG. 14, the antenna element portion 8 and the ground conductors G3 and G4 formed on the back surface of the dielectric substrate 1 are indicated by dotted lines.

The dielectric substrate 1 has a first surface (front surface) and a second surface (back surface) that face each other. The antenna element of the antenna device 100D is provided on the surface of the dielectric substrate 1, and is provided on the antenna element portion 7 having the first resonance frequency and on the back surface of the dielectric substrate 1, and has a second resonance different from the first resonance frequency. And an antenna element portion 8 having a frequency. The antenna element portion 7 and the antenna element portion 8 are connected to each other by a via conductor 9 that penetrates the dielectric substrate 1. The antenna device 100D operates in two frequency bands by exciting the antenna element portion 7 at the first resonance frequency and exciting the antenna element portion 8 at the second resonance frequency via the feeding point P1.

[5-2. Effect]
In the antenna device 100D of the fifth embodiment, the dielectric substrate 1 has a first surface and a second surface that face each other. The antenna element of the antenna device 100D is provided on the first surface of the dielectric substrate 1, and is provided on the antenna element portion 7 having the first resonance frequency and on the second surface of the dielectric substrate 1, and the first resonance frequency is And an antenna element portion 8 having a different second resonance frequency. The antenna element portion 7 and the antenna element portion 8 are connected to each other by a via conductor 9 that penetrates the dielectric substrate 1.

According to the antenna device 100D of the fifth embodiment, it is possible to make it difficult for SAR to increase while being operable in two frequency bands.

[6. Embodiment 6]
Hereinafter, an electronic apparatus according to the sixth embodiment will be described with reference to FIGS.

[6-1. Constitution]
FIG. 15 is a plan view showing a configuration of an antenna device 100E according to the sixth embodiment. FIG. 16 is a plan view showing the configuration of the back surface of the antenna device 100E of FIG. The antenna device 100E includes a plate-shaped dielectric substrate 1, a stub element 3, a parasitic element 5, antenna element portions 7 and 8, a via conductor 9, and ground conductors G1 and G3 provided on the dielectric substrate 1. I have. The antenna device 100E substantially includes antenna element portions 7 and 8 and a via conductor 9 instead of the antenna element 2 of the antenna device 100B of FIG. 10, and further includes a ground conductor G3. In FIG. 16, the parasitic element 5, the antenna element portion 8, and the ground conductor G3 formed on the back surface of the dielectric substrate 1 are indicated by dotted lines.

Similarly to the antenna device 100D of FIG. 13, the antenna device 100D excites the antenna element portion 7 at the first resonance frequency and the antenna element portion 8 at the second resonance frequency via the feeding point P1, Operates in two frequency bands.

[6-2. Effect]
According to the antenna device 100E of the sixth embodiment, it is possible to make it difficult to increase the SAR while operating in two frequency bands.

[Other Embodiments]
As described above, Embodiments 1 to 6 have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to embodiments in which changes, replacements, additions, omissions, and the like have been made as appropriate. In addition, it is possible to combine the components described in the first to sixth embodiments into a new embodiment.

Therefore, other embodiments will be exemplified below.

Two or more disclosed embodiments may be combined. For example, the electronic device of the first embodiment may include the antenna devices 100A to 100E of the second to sixth embodiments.

The electronic apparatus may include one antenna device or three or more antenna devices.

The shape and arrangement of the ground element 4 are not limited to those shown in FIG. 6 and the like, but are opposed to the second end (open end) of the antenna element 2 and are electromagnetically coupled to the second end of the antenna element 2. Anything is acceptable. Similarly, the shape and arrangement of the parasitic element 5 are not limited to those shown in FIG. 10 and the like, but are opposed to the second end of the antenna element 2 and are electromagnetically coupled to the second end of the antenna element 2. If it is.

The entire metal chassis 22 is not limited to the one provided inside the outer casing 21, and a part of the metal chassis 22 may be exposed to the outside of the outer casing 21. If the first edge of the dielectric substrate 1 faces the outer casing 21 and the second edge of the dielectric substrate 1 faces the metal chassis 22, the outer casing 21 and the metal chassis 22 are arranged. May have any configuration.

As described above, the embodiment has been described as an example of the technique in the present disclosure. For this purpose, the accompanying drawings and detailed description are provided.

Accordingly, among the components described in the accompanying drawings and the detailed description, not only the components essential for solving the problem, but also the components not essential for solving the problem in order to illustrate the above technique. May also be included. Therefore, it should not be immediately recognized that these non-essential components are essential as those non-essential components are described in the accompanying drawings and detailed description.

In addition, since the above-described embodiment is for exemplifying the technique in the present disclosure, various modifications, replacements, additions, omissions, and the like can be performed within the scope of the claims or an equivalent scope thereof.

The antenna device according to the present disclosure can operate in a multiband, and is very effective when a wider-band operation is required among multiband antennas. The antenna device according to the present disclosure can reduce SAR, and can easily satisfy the regulations of related laws of SAR.

DESCRIPTION OF SYMBOLS 1 Dielectric board | substrate 2 Antenna element 3 Stub element 4 Ground element 5 Parasitic element 6 Short-circuit conductor 7, 8 Antenna element part 9 Via conductor 11, 11-1, 11-2 High frequency signal source 21 Outer housing 22 Metal chassis 23 Display apparatus 100, 100-1, 100-2, 100A to 100E, 200, 200A Antenna devices G1 to G4 Ground conductor P1 Feed point P2 Connection point

Claims (10)

A plate-like dielectric substrate;
An antenna element provided on the dielectric substrate;
A stub element provided on the dielectric substrate,
The dielectric substrate includes a first edge extending along a longitudinal direction of the dielectric substrate, and a second edge extending along the longitudinal direction of the dielectric substrate and facing the first edge. Have
The antenna element is provided along the longitudinal direction of the dielectric substrate, and the antenna element has a first end having a feeding point and a second end having an open end,
The stub element is provided along a longitudinal direction of the dielectric substrate between a predetermined length section of the antenna element including the first end of the antenna element and a first edge of the dielectric substrate. The stub element has a first end connected to a reference potential and a second end having an open end,
Antenna device. The electrical length of the stub element is less than ¼ of the operating wavelength of the antenna device, and shorter than the electrical length of the antenna element,
The antenna element and the stub element are arranged so that a high-frequency current flows in a loop around a region sandwiched between the antenna element and the stub element when the antenna device operates at a resonance frequency of the antenna element. The
The antenna device according to claim 1. The antenna device further includes a parasitic element provided on the dielectric substrate,
The parasitic element has a first end connected to the reference potential and a second end having an open end, and includes a second end of the parasitic element. The section is provided to face the second end of the antenna element,
The parasitic element is configured to resonate at a frequency within the operating frequency band of the antenna element or at a frequency within a frequency band adjacent to the operating frequency band of the antenna element.
The antenna device according to claim 1 or 2. The antenna device further includes a parasitic element provided on the dielectric substrate,
At least a part of the parasitic element is provided to face the second end of the antenna element,
The parasitic element is not electrically connected to other conductors,
The parasitic element is configured to resonate at a frequency within the operating frequency band of the antenna element or at a frequency within a frequency band adjacent to the operating frequency band of the antenna element.
The antenna device according to claim 1 or 2. The parasitic element is formed in a U-shaped pattern on the dielectric substrate, and both ends of the parasitic element are at the second end of the antenna element rather than the central part of the parasitic element. Provided close to the
The antenna device according to claim 4. The antenna element is connected to the reference potential via a short-circuit conductor on the second edge side of the dielectric substrate, whereby the antenna device is configured to operate as an inverted F-type antenna.
The antenna device according to claim 1 or 2. The dielectric substrate has a first surface and a second surface facing each other,
The antenna element is provided on a first surface of the dielectric substrate and is provided on a first antenna element portion having a first resonance frequency and a second surface of the dielectric substrate, and is different from the first resonance frequency. A second antenna element portion having a second resonance frequency,
The first antenna element portion and the second antenna element portion are connected to each other by a via conductor that penetrates the dielectric substrate.
The antenna device according to claim 1 or 2. A housing,
An electronic device comprising at least one antenna device according to claim 1 or 2,
The housing includes an outer housing portion made of a dielectric, and an inner housing portion made of a conductor provided inside the outer housing portion,
Each of the at least one antenna device is disposed such that a first edge of the dielectric substrate faces the outer casing portion and a second edge of the dielectric substrate faces the inner casing portion. ,
Electronics. The housing has a first surface and a second surface facing each other,
The electronic device further includes a display device provided on the first surface of the housing,
The dielectric substrate is disposed closer to the first surface than the second surface of the housing.
The electronic device according to claim 8. The dielectric substrate is disposed on substantially the same plane as the display surface of the display device.
The electronic device according to claim 9.

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